ci: the MRI retry budget went stale the same way JRuby's did

[pftg]

3.3/rails81 timed out on run 32889000873 and cancelled nine sibling cells with it. Tests were still printing dots when SIGTERM landed — slow, not hung: the same signature as the JRuby timeout #289 fixed one release ago.

#289 explicitly left MRI alone, and was right at the time

"MRI is 128s against 3 min and does not move."

Measured now on run 32770212615, the last green master run:

cell	attempt
3.4/rails81	78s
4.0/rails72	89s
3.4/rails80	123s
4.0/rails80	131s
3.4/rails71	132s
3.4/rails72	134s
3.3/rails81	144s — vs a 180s cap, and the cell that timed out
4.0/edge	146s

23% headroom at the slowest, down from the ~40% the 3-minute figure was chosen for.

Fix

4 minutes puts the slowest back to ~64%, and the job cap follows so the arithmetic stays true: 1 + 4 + 4 = 9.

The comment now states the general rule outright, because this is the second time:

These numbers are measurements, not settings. A suite that grows silently erodes every budget derived from it, and the failure mode is a cell that has been passing by seconds until the day it doesn't.

Costs nothing on a green run — a ceiling, not a sleep. YAML validated.

Unblocks #290, whose only real failure was this timeout.

Summary by Sourcery

Restore sufficient CI time for MRI test matrix cells by recalibrating their retry and job timeout budgets.

Bug Fixes:

• Increase MRI test-cell timeouts and the overall job timeout to prevent slow, still-progressing test runs from being cancelled as failures.

Enhancements:

• Document the need to remeasure and raise both per-attempt and job timeout budgets together as test-suite duration grows.

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📥 Commits

Reviewing files that changed from the base of the PR and between df78dc0 and 6e777e6.

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• .github/workflows/test.yml

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Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the GitHub Actions MRI retry budget from 3/8 to 4/9 minutes after a measured 144-second cell timed out, while documenting the rationale and preserving a job cap that accommodates setup plus two attempts.

File-Level Changes

Change	Details	Files
Increase MRI test attempt and job timeouts to prevent slow-but-progressing cells from being cancelled.	Raise the MRI per-attempt timeout from 3 to 4 minutes. Raise the MRI job cap from 8 to 9 minutes to preserve setup plus two-attempt budget arithmetic. Retain the existing two-attempt strategy and JRuby budgets. Document the measurement-driven timeout policy and the need to raise both related limits together.	.github/workflows/test.yml

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